Using Kotlin for Server-side Development

Kotlin is a great fit for developing server-side applications, allowing you to write concise and expressive code while
maintaining full compatibility with existing Java-based technology stacks and a smooth learning curve:

Scalability: Kotlin's support for coroutines helps build server-side applications
that scale to massive numbers of clients with modest hardware requirements.

Interoperability: Kotlin is fully compatible with all Java-based frameworks, which lets you stay on your
familiar technology stack while reaping the benefits of a more modern language.

Migration: Kotlin supports gradual, step by step migration of large codebases from Java to Kotlin. You can start
writing new code in Kotlin while keeping older parts of your system in Java.

Tooling: In addition to great IDE support in general, Kotlin offers framework-specific tooling (for example,
for Spring) in the plugin for IntelliJ IDEA Ultimate.

Learning Curve: For a Java developer, getting started with Kotlin is very easy. The automated Java to Kotlin converter included in the Kotlin plugin helps with the first steps. Kotlin Koans offer a guide through the key features of the language with a series of interactive exercises.

Ktor is a framework built by JetBrains for creating Web applications in Kotlin, making use of coroutines for high scalability and offering an easy-to-use and idiomatic API.

kotlinx.html is a DSL that can be used to build HTML in a Web application.
It serves as an alternative to traditional templating systems such as JSP and FreeMarker.

The available options for persistence include direct JDBC access, JPA, as well as using NoSQL databases through their Java drivers.
For JPA, the kotlin-jpa compiler plugin adapts
Kotlin-compiled classes to the requirements of the framework.

Deploying Kotlin Server-side Applications

Kotlin applications can be deployed into any host that supports Java Web applications, including Amazon Web Services,
Google Cloud Platform and more.

Users of Kotlin on the Server Side

Corda is an open-source distributed ledger platform, supported by major
banks, and built entirely in Kotlin.

JetBrains Account, the system responsible for the entire license sales and validation
process at JetBrains, is written in 100% Kotlin and has been running in production since 2015 with no major issues.